{"cve":"CVE-2026-65594","nvd":{"published":"2026-07-22T12:18:19.527","modified":"2026-10-24T17:10:00.220","status":"Analyzed","description":"n8n before 2.29.8 and 2.30.x before 2.30.1 (affected from 2.27.0, when the OAuth 2.1 consent and token-issuance flow was introduced) does not verify that the authenticated user has access to the workflow referenced as the OAuth resource. On instances with at least one active MCP Server Trigger workflow configured with n8n OAuth2 authentication, a member-level user can register an OAuth client, self-approve consent for another user's workflow, and obtain a valid token. The workflow then runs in the owner's project context with the owner's stored credentials, and the attacker can set tool inputs and read outputs (potentially including data from the owner's connected integrations), breaking user and project isolation.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:L/SA:N","score":5.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5},"cwes":["CWE-863"],"references":["https://github.com/n8n-io/n8n/security/advisories/GHSA-q5xf-xhwf-cwqf","https://www.vulncheck.com/advisories/n8n-before-missing-oauth-authorization-check"],"products":["n8n:n8n"],"source":"nvd","synced_at":"2026-10-25T17:50:08.599881581+00:00"},"epss":{"cve":"CVE-2026-65594","score":0.0044,"percentile":0.37989,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-q5xf-xhwf-cwqf","url":"https://osv.dev/vulnerability/GHSA-q5xf-xhwf-cwqf","summary":"n8n: Member-Level Users Can Execute Other Users' MCP Server Trigger Workflows via Missing OAuth Authorization Check","modified":"2026-07-22T22:56:43.664368Z","packages":[{"ecosystem":"npm","name":"n8n","purl":"pkg:npm/n8n","ranges":[">=2.30.0 <2.30.1"],"fixed":["2.30.1"]},{"ecosystem":"npm","name":"n8n","purl":"pkg:npm/n8n","ranges":["<2.29.8"],"fixed":["2.29.8"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}